Description

free5GC UDR is the Policy Control Function (PCF) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. A memory leak vulnerability in versions prior to 1.4.3 allows any unauthenticated attacker with network access to the PCF SBI interface to cause uncontrolled memory growth by sending repeated HTTP requests to the OAM endpoint. The root cause is a `router.Use()` call inside an HTTP handler that registers a new CORS middleware on every incoming request, permanently growing the Gin router's handler chain. This leads to progressive memory exhaustion and eventual Denial of Service of the PCF, preventing all UEs from obtaining AM and SM policies and blocking 5G session establishment. Version 1.4.3 contains a patch.

Weaknesses 1

Affected Products 2

References 2

• github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-98cp-84m9-q3qp
  ExploitVendor Advisory
• github.com https://github.com/free5gc/pcf/commit/599803b1b2eb4611e26d5216481ee142bce71a16
  Patch

Remediation

• github.com https://github.com/free5gc/pcf/commit/599803b1b2eb4611e26d5216481ee142bce71a16
  Patch